A study on periodic verification of MOV performance

Developed in this study are the optimized valve diagnostic technique which detect early the abnormal symptom during the surveillance of the valve and consequently reduce the irradiation in a maximum. The major direction of the development is to detect in advance the valve degradation by monitoring changes in motor power due to the changes in motor current input. The development strategies in phase are as follows : understanding of the state of art of the technique and collection of the related material, survey of the material on the failure mode, types, and the operating conditions of the MOVs, investigation of the state of the art of the technique. Understanding of the operating principle of the valve. Design and manufacture of the experiment facility. Development of the diagnostic technique, development of the method detecting the abnormal symptom by monitoring the changes of the motor current signature through simulating the abnormal conditions